Working method: Super-thick Yongdingmen Station, the tank body adopts the tank body technology of "sealing and milling". First, cooperate with the hydraulic oil tank machine to capture the strips on it, and the remaining pebbles will be milled by the milling machine. Finally, the wall was finished. On-site fabrication of ground wall reinforcement cage, underwater concrete hole pressing. Job Description: The underwater excavation building platform of Bailey steel frame platform is composed of Bailey skylight and walking system. The lower track is arranged at the top of the underground continuous wall, and the platform can translate along the platform. The upper structure of the platform is an upper Berre platform, which is semi-symmetrical left and right, and half of it is vertically connected to the horizontal support. The outer cover is reinforced with external steel bars, which is equivalent to wearing solid armor on the left side.
Brief introduction of the method: Using the soil under the water station under the water drilling rig, a water-digging platform was built by Bailey Tian, which was placed above the foundation pit of the station, and the soil above the platform was taken by the rotary drilling rig. M, with a distance of1.6m, jump over the hole to prevent collapse. Replacement: It is the first time that a large number of divers are used in the underwater operation of frogman, because of the large amount of water in the construction process and the blind area caused by the supporting structure. There are more than 70 divers in the busiest construction stage. This is the first time in the field of rail transit construction.
The construction of the underwater subway station has been completed. At present, the station is pumping water, dredging and returning graded stones, which is the last layer of underwater excavation. Subway water excavation will form a standard subway station. Deep foundation pit is underwater excavation and underwater concrete in China. After the construction of Beijing subway, a set of management system and operation standards for underwater excavation have been initially established. The research topic of this project has become an important part of the groundwater treatment project in Beijing, and the patent application has been fully promoted. Relying on this project, the project team has written more than ten papers, which is expected to eventually form a standardized guide for subway construction and excavation.